Presentation given at the IEPEC 2017 Conference in Balitmore, by Jon Maxwell of ERS. Massachusetts and California tied for first place in ACEEE 2016 State Energy Efficiency Scorecard. They also have made considerable investment in evaluation. It is notable, then, when these two leading states choose to make major policy decisions regarding the same topic at nearly the same time. Both states chose to update their baseline policy in 2016. This presentation describes key baseline principles that have been formalized in the states’ respective policy documents, compares and contrasts the policies, and provides a narrative discussion of the historical context of the changes.